MacOS Big Sur has stricter file protection. The command sudo unmount -uw/on 10.15 no longer works in Big Sur. In spite of this, HiDPI open is not affected, the traditional open approach is to display file is written to into System directory/System/Library/Displays/Contents/Resources/Overrides, do have risks and System failure after the big upgrade.

Through research, the monitor file is written to the directory/Library/Displays/Contents/Resources/Overrides can obtain the same result

steps

The first step

Go to SCALED RESOLUTIONS FOR YOUR MACBOOKS EXTERNAL MONITOR to create YOUR own display configuration file FOR YOUR own display, go to the red box below, and proceed to step 2 of our tutorial

The second step

Open the terminal and create a directory

sudo mkdir -p /Library/Displays/Contents/Resources/Overrides/
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The third step

Query step 1 to generate files to step 2 to create a directory, below displayProductiD-413c and displayVendorid-10ac modify according to their own display

sudo cp ~/Downloads/DisplayProductID-413c.plist /Library/Displays/Contents/Resources/Overrides/DisplayVendorID-10ac/DisplayProductID-413
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benefits

  • Support for macOS Big Sur
  • You do not need to restart the system after the upgrade
  • Keep the system directory clean
  • Easy to restore, just delete the /Library/Displays/ folder